About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Equipment, Instrumentation and In-Situ Process Monitoring
|
| Presentation Title |
Laser Beam Profiling and High-Temperature Thermal Conductivity Measurements with a Commercial Camera |
| Author(s) |
Hao-Yuan Cheng, Alexander Myers, David Deisenroth, Sergey Mekhontsev, Jordan Weaver, Jonathan Malen |
| On-Site Speaker (Planned) |
Hao-Yuan Cheng |
| Abstract Scope |
This work investigates thermal conductivity measurements of materials at temperatures up to 4000 K, critical for additive manufacturing (AM) processes involving new materials lacking prior characterization. Our method employs AM lasers to heat samples, overcoming limitations in traditional electrical-pulse methods restricted to conductive materials and lower maximum temperatures (~3000 K). Using two-color thermal imaging with a commercial color camera, radial temperature distributions are captured from samples heated by a Directed Energy Deposition (DED) laser system. The temperature-dependent thermal conductivity is determined by comparing these distributions to an analytical model, addressing essential material property data for high-temperature AM modeling. Uncertainties in beam diameter (~10%) can change thermal conductivity predictions by 15%; thus, we developed a cost-effective, portable technique using a monochrome camera to image diffusively scattered laser radiation. This contrasts with conventional, expensive laser beam profilers, providing an efficient and accessible solution for characterizing high-power laser beam profiles in AM applications. |